Toxic air pollutants are poisonous substances in the air that come from natural sources (for example, radon gas coming up from the ground) or from manmade sources (for example, chemical compounds given off by factory smokestacks) and can harm the environment or your health.
Subsequently, Scorpius X-1 was discovered in 1962 by a team, under Riccardo Giacconi, who launched an Aerobee 150 sounding rocket carrying a highly sensitive soft X-ray detector designed by Frank Paolini.
Bunsen and Kirchhoff named the element cesium, from the Latin word âcaesiusâ meaning sky blue, after the blue lines they saw in the spectrum. The Latin spelling is still reflected in British English where cesium is spelt âcaesium.â. In 1861 Bunsen and Kirchhoff also discovered rubidium by the same method.